• Title/Summary/Keyword: linear control algorithm

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A Study on Reactor Capacitance Estimation Algorithm and 5kW Plasma Power Supply Design for Linear Output Control of Wide Range (넓은 범위의 선형 출력 제어를 위한 5kW 플라즈마 전원장치 설계 및 반응기 커패시턴스 추정 알고리즘의 관한 연구)

  • Noh, Hyun-Kyu;Lee, Jun-Young;Kim, Min-Jea
    • The Transactions of the Korean Institute of Power Electronics
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    • v.21 no.6
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    • pp.514-524
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    • 2016
  • This work suggests a study on 5 kW plasma power supply design and reactor capacitance estimation algorithm for a wide range of linear output control to operate a plasma reactor. The suggested study is designed to use a two-stage circuit and control the full-bridge circuit of the two-stage circuit using the buck converter output voltage of the single-stage circuit. The switching frequency of the full-bridge circuit is designed to operate through high-frequency switching and obtain maximum output using LC parallel resonance. Soft switching technique(ZVS) is used to reduce the loss caused by high-frequency switching, and duty control of the buck converter is applied to control a wide range of linear output. The internal capacitance of the reactor cannot easily be extracted, and thus, the reactor cannot be operated in an optimized resonant state. To address this issue, this work designs the internal capacitance of the reactor such that estimations can be performed with the developed reactor capacitance estimation algorithm applied to the internal capacitance of the reactor. A 5 kW plasma power supply is designed for a wide range of linear output control, and the validity of the study on the reactor capacitance estimation algorithm is verified.

Model Reference Adaptive Control Using Non-Euclidean Gradient Descent

  • Lee, Sang-Heon;Robert Mahony;Kim, Il-Soo
    • Transactions on Control, Automation and Systems Engineering
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    • v.4 no.4
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    • pp.330-340
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    • 2002
  • In this Paper. a non-linear approach to a design of model reference adaptive control is presented. The approach is demonstrated by a case study of a simple single-pole and no zero, linear, discrete-time plant. The essence of the idea is to generate a full non-linear model of the plant dynamics and the parameter adaptation dynamics as a gradient descent algorithm with respect to a Riemannian metric. It is shown how a Riemannian metric can be chosen so that the modelled plant dynamics do in fact match the true plant dynamics. The performance of the proposed scheme is compared to a traditional model reference adaptive control scheme using the classical sensitivity derivatives (Euclidean gradients) for the descent algorithm.

Current Control Simulation Research of Moving Coil Type Linear Oscillatory A (가동코일형 LOA 전류제어 시뮬레이션 연구)

  • Jang, S.M.;Kwon, C.;Jeong, S.S.;Lee, S.L.
    • Proceedings of the KIEE Conference
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    • 2001.07b
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    • pp.614-616
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    • 2001
  • This paper describes the current control simulation of the Linear Oscillatory Actuator and then, the dynamic simulation algorithm considering the armature reaction effect. Thirdly, the control algorithm is proposed to reciprocate a load without mechanical spring at the required stroke and position.

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Diagnosis of Linear Systems with Structured Uncertainties based on Guaranteed State Observation

  • Planchon, Philippe;Lunze, Jan
    • International Journal of Control, Automation, and Systems
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    • v.6 no.3
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    • pp.306-319
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    • 2008
  • Reaching fault tolerance in technological systems requires to detect malfunctions. This paper presents a diagnostic method that is robust with respect to unknown-but-bounded uncertainties of the dynamical model and the measurements. By using models of the faultless and the faulty behaviours, a state-set observer computes polyhedral sets from which the consistency of the models with the interval measurements is determined. The diagnostic result is proven to be complete, i.e., the set of faults obtained by the diagnostic algorithm includes the actual fault. The algorithm is illustrated by an application example.

Dynamic Characteristics Analysis of 3D Conveyor System Linear Induction Motor for Control Algorithm Developments (제어알고리즘 개선을 위한 3차원 반송 시스템 선형유도전동기의 동특성 해석)

  • Jeon, Su-Jin;Lee, Jung-Ho
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.56 no.3
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    • pp.514-518
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    • 2007
  • It is necessary to modify the state-of-the-art of speed control theory because of the phase asymmetry in the Linear Induction Motor (LIM)and for the constant speed control of mover using single vector control inverter system, it is important that primary stack is located in appropriated intervals in the 3D conveyer system using LIM. The dynamic characteristic analysis method of the vector controlled LIM using coupled FEM and control algorithm taking into account the movement is proposed. The focus of this paper is the analysis relative to selecting primary stack intervals in order to constant speed control in the 3D conveyer system using LIM.

Development of OHS System Driven by Linear Motor for Automatic Transfer of LCD Panels (선형전동기를 적용한 LCD 패널 자동반송용 순환궤도차량 시스템 개발)

  • Kim, Won-Gon;Yun, Jong-Bo;Park, Gun-Woo;Hwang, Gye-Ho
    • Journal of the Semiconductor & Display Technology
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    • v.7 no.3
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    • pp.11-16
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    • 2008
  • The authors investigated an overhead shuttle (OHS) system for automatic transferring the liquid crystal display (LCD) panels. The constructed tracks of OHS system include the linear and curve regions and have been installed on the ceiling to transfer the cassette of LCD glass along the closed-loop and open-loop tracks. In this study, the OHS system was implemented by a proposed linear motor to solve encoder installation and the system cost problems of the long distance transfer system. In addition, we utilized a new algorithm of the position detection and a new control algorithm for driving linear motor. The newly developed control algorithm was demonstrated from both a computer simulation and an experimentation, indicating that the highly reliable and speedy transfer system can enhance the LCD panel productivity of commercial OHS system.

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Active Vibration Control of Vehicle by Active Linear Actuator and Filtered-x LMS Algorithm (전동식 동흡진기와 Filtered-X LMS알고리즘을 이용한 차량의 능동진동제어 실험)

  • Lee, Han-Dong;Kwak, Moon-K.;Kim, Jeong-Hoon;Song, Yoon-Chul;Park, Woon-Han
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2009.10a
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    • pp.357-363
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    • 2009
  • This paper deals with the Filtered-x Least Mean Square algorithm for a active vibration control in vehicle vibration reduction. Before applying the proposed FxLMS algorithm to automobile, the performance of the FxLMS algorithm is simulated using sensor data of a vehicle. The FxLMS algorithm requires that reference signal be a representation of disturbance signal and the plant model be incorporated into the computation path. To this end, The system identification is carried out to obtain the plant model based on the measurement results. A tachometer signal is used as reference signal. The FxLMS control algorithm is first tested using simulation and applied to a vehicle. Experimental results show that the proposed control algorithm can reduce vibration level in a short period of time.

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A Model Predictive Tracking Control Algorithm of Autonomous Truck Based on Object State Estimation Using Extended Kalman Filter (확장 칼만 필터를 이용한 대상 상태 추정 기반 자율주행 대차의 모델 예측 추종 제어 알고리즘)

  • Song, Taejun;Lee, Hyewon;Oh, Kwangseok
    • Journal of Drive and Control
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    • v.16 no.2
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    • pp.22-29
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    • 2019
  • This study presented a model predictive tracking control algorithm of autonomous truck based on object state estimation using extended Kalman filter. To design the model, the 1-layer laser scanner was used to estimate position and velocity of the object using extended Kalman filter. Based on these estimations, the desired linear path for object tracking was computed. The lateral and yaw angle errors were computed using the computed linear path and relative positions of the truck. The computed errors were used in the model predictive control algorithm to compute the optimal steering angle for object tracking. The performance evaluation was conducted on Matlab/Simulink environments using planar truck model and actual point data obtained from laser scanner. The evaluation results showed that the tracking control algorithm developed in this study can track the object reasonably based on the model predictive control algorithm based on the estimated states.

New Algorithm for Recursive Estimation in Linear Discrete-Time Systems with Unknown Parameters

  • Shin Vladimir;Ahn Jun-Il;Kim Du-Yong
    • International Journal of Control, Automation, and Systems
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    • v.4 no.4
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    • pp.456-465
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    • 2006
  • The problem of recursive filtering far linear discrete-time systems with uncertainties is considered. A new suboptimal filtering algorithm is herein proposed. It is based on the fusion formula, which represents an optimal mean-square linear combination of local Kalman estimates with weights depending on cross-covariances between local filtering errors. In contrast to the optimal weights, the suboptimal weights do not depend on current measurements, and thus the proposed algorithm can easily be implemented in real-time. High accuracy and efficiency of the suboptimal filtering algorithm are demonstrated on the following examples: damper harmonic oscillator motion and vehicle motion constrained to a plane.

An Efficient Computational Method for Linear Time-invariant Systems via Legendre Wavelet (르장드르 웨이블릿을 이용한 선형 시불변 시스템의 효율적 수치 해석 방법)

  • Kim, Beomsoo
    • Journal of Institute of Control, Robotics and Systems
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    • v.19 no.7
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    • pp.577-582
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    • 2013
  • In this paper Legendre wavelets are used to approximate the solutions of linear time-invariant system. The Legendre wavelet and its integral operational matrix are presented and an efficient algorithm to solve the Sylvester matrix equation is proposed. The algorithm is based on the decomposition of the Sylvester matrix equation and the preorder traversal algorithm. Using the special structure of the Legendre wavelet's integral operational matrix, the full order Sylvester matrix equation can be solved in terms of the solutions of pure algebraic matrix equations, which reduce the computation time remarkably. Finally a numerical example is illustrated to demonstrate the validity of the proposed algorithm.